AFAIK, X870 = X670, only on 800 is USB4 mandatory, so nothing new with 800 chipsets.
Recently I purchased 2nd hand
Asus X670E-E for 250 EUR with 24+ months warranty left, since I do not need USB4 but will use 4 NVMe SSD in near future. For 250 EUR of new board I can buy entry level X870(E) or lower midrange od B850 in 2025, so I opted for almost-flagship board (yes, I said I won't buy Asus anymore, but a new one, and since my money didn't went to Asus, I'm good)
Maybe I am wrong about this, but as said, majority of media said the same thing.